cooling is not an issue with this gpu. you can push it to 1100 Mhz without any issues at all as long as you push the fan to 100%. the highest i've gotten the clocks without overvolting is 1150 core, 1500 mem. no cooling problems at all.

also keep in mind the default target temperature for this card is 95C. so it is designed to run a lot warmer than previous GPUs.